Isaiah 6:2-3 [6:2] Above it stood the seraphims: each one had six wings; with twain he covered his face, and with twain he covered his feet, and with twain he did fly. [6:3] And one cried unto another, and said, Holy, holy, holy , is the LORD of hosts: the whole earth is full of his glory.
Revelation 4:8 And the four beasts had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy , LORD God Almighty, which was, and is, and is to come.